In this section, we present an example of stable self-interactions
in the model (REF ). The interactions are non-Lagrangian.
The dynamics of the non-linear theory is determined by the equations
of motion. The interactions are associated with the deformations of
free equations of motion that preserve the gauge symmetries and
gauge identities of free model. The interaction is consistent if the
number of physical degrees of freedom is preserved by coupling. For
details of the concept of consistency of interaction in the class of
not necessary Lagrangian theories, we refer article [1]}.
